CN109617088B - Reactive power and harmonic compensation method and system - Google Patents

Reactive power and harmonic compensation method and system Download PDF

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CN109617088B
CN109617088B CN201811423157.XA CN201811423157A CN109617088B CN 109617088 B CN109617088 B CN 109617088B CN 201811423157 A CN201811423157 A CN 201811423157A CN 109617088 B CN109617088 B CN 109617088B
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CN109617088A (en
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王轩
付永生
王广柱
王海龙
詹雄
李兰芳
贺春
刘红恩
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Shandong University
NARI Group Corp
China EPRI Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

本发明的一种无功及谐波补偿方法及系统，当补偿装置容量小于系统要求补偿的容量时：基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流，提供了有限补偿无功电流和有限补偿谐波电流两种方法，实现了无功及谐波补偿的合理分配，不会产生额外的无功及谐波电流。

Figure 201811423157

In the reactive power and harmonic compensation method and system of the present invention, when the capacity of the compensation device is less than the capacity required for compensation by the system: the priority compensation current is determined as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current. wave current; when the priority compensation current is reactive current, the reactive current priority compensation strategy is executed; when the priority compensation current is harmonic current, the harmonic current priority compensation strategy is executed; wherein, the reactive current priority compensation strategy and The harmonic current priority compensation strategy includes: determining the final compensation current based on the three-phase current peak value of the reactive current and the harmonic current and the current limit value of the compensation device, providing both limited compensation reactive current and limited compensation harmonic current. This method realizes the reasonable distribution of reactive power and harmonic compensation without generating additional reactive power and harmonic current.

Figure 201811423157

Description

一种无功及谐波补偿方法及系统A reactive power and harmonic compensation method and system

技术领域technical field

本发明涉及配电网电能质量控制领域，具体涉及一种无功及谐波补偿方法及系统。The invention relates to the field of power quality control of distribution networks, in particular to a reactive power and harmonic compensation method and system.

背景技术Background technique

随着现代工业的发展，电网中非线性负荷(例如晶闸管整流设备、电弧炉、家用电器等)大量增加，使得电网中的无功及谐波问题日益严重。无功及谐波会增加输、供和用电设备及输电线路的额外附加损耗，降低设备的利用率和经济效益，缩短设备的使用寿命。为了改善电能质量、提高功率因数和用电效率、节能降损，谐波及无功补偿装置(如静止无功补偿器(SVC)、静止无功发生器(STATCOM或SVG)、有源电力滤波器(APF))得到广泛应用。高性能的APF及STATCOM装置一般都具有同时补偿无功及谐波的能力，但当装置容量小于系统要求补偿的无功及谐波容量时，由于装置容量限幅，会导致装置不仅不能完全补偿系统要求的无功和谐波，而且还会产生额外的无功及谐波。With the development of modern industry, the nonlinear loads in the power grid (such as thyristor rectifier equipment, electric arc furnaces, household appliances, etc.) have increased significantly, making the problem of reactive power and harmonics in the power grid increasingly serious. Reactive power and harmonics will increase the additional loss of transmission, supply and consumption equipment and transmission lines, reduce the utilization rate and economic benefits of equipment, and shorten the service life of equipment. In order to improve power quality, increase power factor and power efficiency, save energy and reduce losses, harmonic and reactive power compensation devices (such as static var compensator (SVC), static var generator (STATCOM or SVG), active power filter (APF)) are widely used. High-performance APF and STATCOM devices generally have the ability to compensate reactive power and harmonics at the same time, but when the capacity of the device is smaller than the reactive power and harmonic capacity required by the system to be compensated, due to the limited capacity of the device, the device will not only be unable to fully compensate Reactive power and harmonics required by the system, and additional reactive power and harmonics will be generated.

发明内容Contents of the invention

为了解决现有技术中所存在的问题，本发明提供一种无功及谐波补偿方法及系统。In order to solve the problems existing in the prior art, the present invention provides a reactive power and harmonic compensation method and system.

本发明提供的技术方案是：The technical scheme provided by the invention is:

一种无功及谐波补偿方法，所述方法包括：A reactive power and harmonic compensation method, the method comprising:

当补偿装置容量小于系统要求补偿的容量时：When the capacity of the compensation device is less than the capacity required by the system to be compensated:

基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；Determine the priority compensation current as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current;

当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；When the priority compensation current is reactive current, execute the reactive current priority compensation strategy; when the priority compensation current is harmonic current, execute the harmonic current priority compensation strategy;

其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流。Wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy include: determining the final compensation current based on the three-phase current peak values of the reactive current and harmonic current and the current limit value of the compensation device.

优选的，所述无功电流优先补偿策略，包括：Preferably, the reactive current priority compensation strategy includes:

获取无功电流、谐波电流、纯无功电流和指定谐波电流；Obtain reactive current, harmonic current, pure reactive current and specified harmonic current;

对所述无功电流和谐波电流总补偿电流的三相电流峰值进行判断；Judging the three-phase current peak value of the total compensation current of the reactive current and the harmonic current;

若所述三相电流峰值均未超出补偿电流限幅值，则所述总补偿电流为最终补偿电流；If none of the three-phase current peak values exceeds the compensation current limit value, the total compensation current is the final compensation current;

否则，基于所述纯无功电流和指定谐波电流生成无功及指定谐波电流，通过与所述补偿电流限幅值进行比较，确定最终补偿电流。Otherwise, a reactive power and a specified harmonic current are generated based on the pure reactive current and the specified harmonic current, and the final compensation current is determined by comparing with the compensation current limit value.

优选的，所述基于所述纯无功电流和指定谐波电流生成无功及指定谐波电流，通过与所述补偿电流限幅值进行比较，确定最终补偿电流，包括：Preferably, the generation of reactive power and specified harmonic current based on the pure reactive current and the specified harmonic current is compared with the compensation current limit value to determine the final compensation current, including:

基于指定谐波电流的重要程度对所有指定谐波电流依次进行排序；Sort all specified harmonic currents in sequence based on the importance of specified harmonic currents;

基于排序后的所述指定谐波电流依次生成对应的无功及指定谐波电流；Generating corresponding reactive power and specified harmonic currents sequentially based on the sorted specified harmonic currents;

从第一个所述无功及指定谐波电流的三相电流峰值与所述电流限幅值进行比较；From the first three-phase current peak value of the reactive power and specified harmonic current to compare with the current limit value;

直到无功及指定谐波电流的三相电流峰值均小于电流限幅值，或者进行到所述指定谐波电流的最后一个，将前一个无功及指定谐波电流作为最终补偿电流。Until the three-phase current peak values of the reactive power and the designated harmonic current are less than the current limit value, or proceed to the last of the designated harmonic currents, and use the previous reactive power and designated harmonic current as the final compensation current.

优选的，所述基于排序后的所述指定谐波电流依次生成对应的无功及指定谐波电流，计算式如下：Preferably, the corresponding reactive power and specified harmonic current are sequentially generated based on the sorted specified harmonic current, and the calculation formula is as follows:

Figure BDA0001880979090000021
Figure BDA0001880979090000021

式中，ix1、ix2、…，ixn为无功及指定谐波电流指令；ix0为纯无功电流指令；ixh1、ixh2…ixhn为指定谐波电流，其中n为指定谐波电流的数量。In the formula, ix1, ix2, ..., ixn are reactive and specified harmonic current commands; ix0 is pure reactive current command; ixh1 , ixh2 ... ixhn are specified harmonic currents , where n is specified The number of harmonic currents.

优选的，所述谐波电流优先补偿策略，包括：Preferably, the harmonic current priority compensation strategy includes:

基于所述无功电流和谐波电流获取无功电流和谐波电流三相电流峰值的最大值；Obtaining the maximum value of the three-phase current peak values of the reactive current and the harmonic current based on the reactive current and the harmonic current;

基于所述谐波电流三相电流峰值的最大值和电流限幅值计算补偿余量；calculating a compensation margin based on the maximum value of the harmonic current three-phase current peak value and the current limit value;

基于所述余量通过限幅器进行限幅处理；performing clipping processing by a clipper based on the margin;

基于处理后的补偿余量、无功电流三相电流峰值的最大值和谐波电流的三相电流计算最终补偿电流。The final compensation current is calculated based on the processed compensation margin, the maximum value of the three-phase current peak value of the reactive current and the three-phase current of the harmonic current.

优选的，所述基于所述谐波电流三相电流峰值的最大值和电流限幅值计算补偿余量，计算式如下：Preferably, the compensation margin is calculated based on the maximum value of the harmonic current three-phase current peak value and the current limit value, and the calculation formula is as follows:

Iq0＝Ilim-Ihmax I q0 =I lim -I hmax

式中，Iq0为补偿余量；Ilim为电流限幅值；Ihmax为谐波电流峰值的最大值。In the formula, I q0 is the compensation margin; I lim is the current limit value; I hmax is the maximum value of the harmonic current peak value.

优选的，所述基于处理后的补偿余量、无功电流三相电流峰值的最大值和谐波电流的三相电流计算最终补偿电流，包括：Preferably, the calculation of the final compensation current based on the processed compensation margin, the maximum value of the peak value of the reactive current three-phase current and the three-phase current of the harmonic current includes:

Figure BDA0001880979090000031
Figure BDA0001880979090000031

式中，ix *为最终补偿电流；Iq为处理后的补偿余量；Iqmax无功电流三相电流峰值的最大值；ixh为谐波电流的三相电流；ix0为无功电流的三相电流。In the formula, ix * is the final compensation current; I q is the compensation margin after processing; I qmax is the maximum value of the peak value of the three-phase current of the reactive current; ixh is the three-phase current of the harmonic current; ix0 is the reactive power Three-phase current of current.

一种无功及谐波补偿系统，所述系统包括：A reactive power and harmonic compensation system, said system comprising:

确定模块：用于当补偿装置容量小于系统要求补偿的容量时：Determination module: used when the capacity of the compensation device is less than the capacity required by the system to compensate:

基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；Determine the priority compensation current as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current;

执行模块：用于当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；Execution module: used to execute the reactive current priority compensation strategy when the priority compensation current is reactive current; when the priority compensation current is harmonic current, execute the harmonic current priority compensation strategy;

其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流。Wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy include: determining the final compensation current based on the three-phase current peak values of the reactive current and harmonic current and the current limit value of the compensation device.

优选的，所述执行模块，包括：无功电流优先补偿子模块；Preferably, the execution module includes: reactive current priority compensation sub-module;

所述无功电流优先补偿子模块，用于获取无功电流、谐波电流、纯无功电流和指定谐波电流；The reactive current priority compensation sub-module is used to obtain reactive current, harmonic current, pure reactive current and specified harmonic current;

对所述无功电流和谐波电流总补偿电流的三相电流峰值进行判断；Judging the three-phase current peak value of the total compensation current of the reactive current and the harmonic current;

若所述三相电流峰值均未超出补偿电流限幅值，则所述总补偿电流为最终补偿电流；If none of the three-phase current peak values exceeds the compensation current limit value, the total compensation current is the final compensation current;

否则，基于所述纯无功电流和指定谐波电流生成无功及指定谐波电流，通过与所述补偿电流限幅值进行比较，确定最终补偿电流。Otherwise, a reactive power and a specified harmonic current are generated based on the pure reactive current and the specified harmonic current, and the final compensation current is determined by comparing with the compensation current limit value.

优选的，所述执行模块，还包括：谐波电流优先补偿子模块；Preferably, the execution module further includes: a harmonic current priority compensation sub-module;

所述谐波电流优先补偿子模块，用于基于所述无功电流和谐波电流获取无功电流和谐波电流三相电流峰值的最大值；The harmonic current priority compensation sub-module is used to obtain the maximum value of the three-phase current peak value of the reactive current and the harmonic current based on the reactive current and the harmonic current;

基于所述谐波电流三相电流峰值的最大值和电流限幅值计算补偿余量；calculating a compensation margin based on the maximum value of the harmonic current three-phase current peak value and the current limit value;

基于所述余量通过限幅器进行限幅处理；performing clipping processing by a clipper based on the margin;

基于处理后的补偿余量、无功电流三相电流峰值的最大值和谐波电流的三相电流计算最终补偿电流。The final compensation current is calculated based on the processed compensation margin, the maximum value of the three-phase current peak value of the reactive current and the three-phase current of the harmonic current.

与现有技术相比，本发明的有益效果为：Compared with prior art, the beneficial effect of the present invention is:

本发明的一种无功及谐波补偿方法及系统，当补偿装置容量小于系统要求补偿的容量时：基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流，提供了有限补偿无功电流和有限补偿谐波电流两种方法，实现了无功及谐波补偿的合理分配，不会产生额外的无功及谐波电流。A reactive power and harmonic compensation method and system of the present invention, when the capacity of the compensation device is less than the capacity required by the system: determine the priority compensation current as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current ripple current; when the priority compensation current is reactive current, execute the reactive current priority compensation strategy; when the priority compensation current is harmonic current, execute the harmonic current priority compensation strategy; wherein, the reactive current priority compensation strategy and The harmonic current priority compensation strategy includes: determining the final compensation current based on the three-phase current peak value of the reactive current and the harmonic current and the current limit value of the compensation device, providing both limited compensation reactive current and limited compensation harmonic current. This method realizes the reasonable distribution of reactive power and harmonic compensation, and will not generate additional reactive power and harmonic current.

附图说明Description of drawings

图1为本发明的无功及谐波补偿方法流程图；Fig. 1 is reactive power and harmonic compensation method flowchart of the present invention;

图2为本发明的优先无功补偿的无功及谐波补偿分配流程图；Fig. 2 is the flow chart of reactive power and harmonic compensation distribution of priority reactive power compensation in the present invention;

图3为本发明的优先无功补偿的无功及谐波补偿分配的输出选择环节流程图；Fig. 3 is the flow chart of the output selection link of reactive power and harmonic compensation distribution of priority reactive power compensation in the present invention;

图4为本发明的优先无功补偿的无功及谐波补偿分配的限幅判断环节流程图；Fig. 4 is the flow chart of the limit judgment link of reactive power and harmonic compensation distribution of priority reactive power compensation in the present invention;

图5为本发明的优先谐波补偿的无功及谐波补偿分配流程图。Fig. 5 is a flow chart of reactive power and harmonic compensation allocation of priority harmonic compensation in the present invention.

具体实施方式Detailed ways

为了更好地理解本发明，下面结合说明书附图和实例对本发明的内容做进一步的说明。In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

本发明提出一种无功及谐波补偿方法，能够在装置容量小于系统要求的无功及谐波补偿容量时，实现无功及谐波补偿的合理分配。如图1所示，具体步骤如下：The invention proposes a reactive power and harmonic compensation method, which can realize reasonable distribution of reactive power and harmonic compensation when the device capacity is smaller than the reactive power and harmonic compensation capacity required by the system. As shown in Figure 1, the specific steps are as follows:

步骤一：当补偿装置容量小于系统要求补偿的容量时：Step 1: When the capacity of the compensation device is less than the capacity required by the system for compensation:

基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；Determine the priority compensation current as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current;

步骤二：当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；Step 2: When the priority compensation current is reactive current, execute the reactive current priority compensation strategy; when the priority compensation current is harmonic current, execute the harmonic current priority compensation strategy;

其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流。Wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy include: determining the final compensation current based on the three-phase current peak values of the reactive current and harmonic current and the current limit value of the compensation device.

实施例1：Example 1:

步骤一：当补偿装置容量小于系统要求补偿的容量时：Step 1: When the capacity of the compensation device is less than the capacity required by the system for compensation:

基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；Determine the priority compensation current as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current;

是以无功优先为补偿原则，即补偿装置优先补偿系统要求的无功电流，在不超出装置容量的前提下再补偿系统要求的谐波电流。所述补偿方法包括无功电流及谐波电流指令环节、指令电流限幅判断环节和指令电流输出选择环节。The compensation principle is based on reactive power priority, that is, the compensation device first compensates the reactive current required by the system, and then compensates the harmonic current required by the system under the premise of not exceeding the device capacity. The compensation method includes a reactive current and harmonic current command link, a command current limiting judgment link, and a command current output selection link.

是以谐波优先为补偿原则，即补偿装置优先补偿系统要求的谐波电流，在不超出装置容量的前提下再补偿系统要求的无功电流。The compensation principle is based on harmonic priority, that is, the compensation device first compensates the harmonic current required by the system, and then compensates the reactive current required by the system under the premise of not exceeding the device capacity.

步骤二：当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；Step 2: When the priority compensation current is reactive current, execute the reactive current priority compensation strategy; when the priority compensation current is harmonic current, execute the harmonic current priority compensation strategy;

其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流。Wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy include: determining the final compensation current based on the three-phase current peak values of the reactive current and harmonic current and the current limit value of the compensation device.

以无功优先为补偿时，具体包括以下步骤：When reactive power priority is used as compensation, it specifically includes the following steps:

(1)：由无功电流及谐波电流指令环节产生无功、谐波电流指令；(1): Reactive power and harmonic current commands are generated by reactive current and harmonic current commands;

(2)：由指令电流限幅判断环节，对所述三相电流指令峰值进行比较，判断峰值是否超出补偿装置电流限幅值；(2): The command current limit judgment link compares the peak value of the three-phase current command to determine whether the peak value exceeds the current limit value of the compensation device;

(3)：根据步骤2的限幅判断结果，选择相应的电流指令作为补偿装置最终补偿电流指令。(3): According to the clipping judgment result in step 2, select the corresponding current command as the final compensation current command of the compensation device.

在(1)中，由无功电流及谐波电流指令环节产生无功+谐波电流指令ixqh(其中下标x＝a,b,c，表示a、b、c三相，下同)、纯无功电流指令ix0、指定谐波电流ixh1、指定谐波电流ixh2、…，及指定谐波电流ixhn(n为最大指定谐波电流数量)。其中，所述无功+谐波电流指令ixqh是无功及谐波同时补偿的总指令电流，指定谐波电流按重要程度依次排序，并按下式(1)依次生成无功及指定谐波电流指令ix1、ix2、…，ixn。In (1), the reactive power + harmonic current command i xqh is generated by the reactive current and harmonic current command link (where the subscript x=a, b, c, means a, b, c three-phase, the same below) , pure reactive current command ix0 , specified harmonic current ixh1 , specified harmonic current ixh2 , ..., and specified harmonic current ixhn (n is the maximum number of specified harmonic currents). Wherein, the reactive power + harmonic current command i xqh is the total command current for reactive power and harmonic compensation at the same time, the specified harmonic currents are sorted in order of importance, and the reactive power and specified harmonic currents are sequentially generated according to formula (1). Wave current commands i x1 , i x2 , . . . , i xn .

Figure BDA0001880979090000061
Figure BDA0001880979090000061

在(2)中，将步骤1产生的所述电流指令输入到所述限幅判断环节，对所述电流指令的峰值与补偿装置电流限幅值Ilim进行比较，若三相所述指令电流峰值有一相大于所述限幅值Ilim，则所述幅值判断环节输出逻辑“1”，否则输出逻辑“0”。具体为：In (2), the current command generated in step 1 is input to the limit judgment link, and the peak value of the current command is compared with the current limit value I lim of the compensation device, if the three-phase command current If one phase of the peak value is greater than the limiting value I lim , the amplitude judging link outputs a logic "1", otherwise it outputs a logic "0". Specifically:

如图2和图3所示，首先对步骤1产生的所述无功+谐波电流指令ixqh的峰值进行判断，若三相ixqh峰值有一相大于所述限幅值Ilim，则所述限幅判断环节输出L＝“1”，否则输出L＝“0”。As shown in Fig. 2 and Fig. 3, firstly, the peak value of the reactive power + harmonic current command i xqh generated in step 1 is judged, if one phase of the three-phase i xqh peak value is greater than the limit value I lim , then the The limiter judging link outputs L=“1”, otherwise it outputs L=“0”.

然后对步骤1产生的所述无功及指定谐波电流指令ixk(其中下标x＝a,b,c，k＝1,2,...,n，下同)的峰值依次进行判断，若三相ixk峰值有一相大于所述限幅值Ilim，则相应所述限幅判断环节输出Lk＝“1”，否则分别输出Lk＝“0”。Then the peak values of the reactive power and specified harmonic current command i xk (wherein subscript x=a, b, c, k=1, 2,..., n, the same below) generated in step 1 are judged sequentially , if one of the peak values of the three phases ixk is greater than the limit value I lim , then the corresponding limit judgment link outputs L k = "1", otherwise outputs L k = "0".

在(3)中，如图4所示，详细步骤如下：In (3), as shown in Figure 4, the detailed steps are as follows:

3.1：首先对步骤2中输出的L进行判断，如果L不等于“1”，则补偿装置最终补偿电流指令ix *＝ixqh，否则，令k＝1，继续下一步骤；3.1: First judge the L output in step 2, if L is not equal to "1", then the compensation device will finally compensate the current command i x * = i xqh , otherwise, let k = 1, and continue to the next step;

3.2：对步骤2中输出的Lk进行判断，如果Lk等于“1”，则补偿装置最终补偿电流指令ix *＝ix(k-1)，否则，令k＝k+1，继续下一步骤；3.2: Judge the L k output in step 2, if L k is equal to "1", then the compensation device will finally compensate the current command i x * = i x(k-1) , otherwise, set k=k+1, continue next step;

3.3：如果k大于n(n为最大指定谐波电流数量)，则补偿装置最终补偿电流指令ix *＝ix(k-1)并结束，否则返回步骤3.2。3.3: If k is greater than n (n is the maximum specified number of harmonic currents), the compensation device finally compensates the current command i x * = i x (k-1) and ends, otherwise returns to step 3.2.

以谐波优先为补偿时，如图5所示，具体包括以下步骤：When the compensation is based on harmonic priority, as shown in Figure 5, the specific steps include the following:

<1>：分别求出三相谐波指令电流ixh和三相无功电流ix0的峰值最大值Ihmax和Iqmax；<1>: Calculate the peak value I hmax and I qmax of the three-phase harmonic command current i xh and the three-phase reactive current i x0 respectively;

<2>：用补偿装置电流限幅值Ilim减去Ihmax得到补偿装置余量Iq0，即Iq0＝Ilim-Ihmax，经过限幅器限幅处理得到Iq，所述限幅器限幅值为Iqmax；<2>: Subtract I hmax from the current limit value I lim of the compensation device to obtain the compensation device margin I q0 , that is, I q0 = I lim -I hmax , and I q is obtained through the limiting process of the limiter, and the limiter The limiter value is I qmax ;

<3>：三相无功电流ix0分别乘以

Figure BDA0001880979090000071
再与三相谐波指令电流ixh相加后得到补偿装置最终补偿电流指令ix *，即<3>: The three-phase reactive current ix0 is multiplied by
Figure BDA0001880979090000071
Then add it to the three-phase harmonic command current i xh to get the final compensation current command i x * of the compensation device, namely

Figure BDA0001880979090000072
Figure BDA0001880979090000072

实施例2：Example 2:

基于同一种发明构思，本发明还提供了一种无功及谐波补偿系统，所述系统包括：Based on the same inventive concept, the present invention also provides a reactive power and harmonic compensation system, which includes:

确定模块：用于当补偿装置容量小于系统要求补偿的容量时：Determination module: used when the capacity of the compensation device is less than the capacity required by the system to compensate:

基于无功电流和谐波电流的补偿电流需求量确定优先补偿电流为无功电流或谐波电流；Determine the priority compensation current as reactive current or harmonic current based on the compensation current demand of reactive current and harmonic current;

执行模块：用于当优先补偿电流为无功电流时，执行无功电流优先补偿策略；当优先补偿电流为谐波电流时，执行谐波电流优先补偿策略；Execution module: used to execute the reactive current priority compensation strategy when the priority compensation current is reactive current; when the priority compensation current is harmonic current, execute the harmonic current priority compensation strategy;

其中，所述无功电流优先补偿策略和谐波电流优先补偿策略包括：基于所述无功电流和谐波电流的三相电流峰值和补偿装置的电流限幅值确定最终补偿电流。Wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy include: determining the final compensation current based on the three-phase current peak values of the reactive current and harmonic current and the current limit value of the compensation device.

所述执行模块，包括：无功电流优先补偿子模块；The execution module includes: reactive current priority compensation sub-module;

所述无功电流优先补偿子模块，用于获取无功电流、谐波电流、纯无功电流和指定谐波电流；The reactive current priority compensation sub-module is used to obtain reactive current, harmonic current, pure reactive current and specified harmonic current;

对所述无功电流和谐波电流总补偿电流的三相电流峰值进行判断；Judging the three-phase current peak value of the total compensation current of the reactive current and the harmonic current;

若所述三相电流峰值均未超出补偿电流限幅值，则所述总补偿电流为最终补偿电流；If none of the three-phase current peak values exceeds the compensation current limit value, the total compensation current is the final compensation current;

否则，基于所述纯无功电流和指定谐波电流生成无功及指定谐波电流，通过与所述补偿电流限幅值进行比较，确定最终补偿电流。Otherwise, a reactive power and a specified harmonic current are generated based on the pure reactive current and the specified harmonic current, and the final compensation current is determined by comparing with the compensation current limit value.

所述执行模块，还包括：谐波电流优先补偿子模块；The execution module also includes: a harmonic current priority compensation sub-module;

所述谐波电流优先补偿子模块，用于基于所述无功电流和谐波电流获取无功电流和谐波电流三相电流峰值的最大值；The harmonic current priority compensation sub-module is used to obtain the maximum value of the three-phase current peak value of the reactive current and the harmonic current based on the reactive current and the harmonic current;

基于所述谐波电流三相电流峰值的最大值和电流限幅值计算补偿余量；calculating a compensation margin based on the maximum value of the harmonic current three-phase current peak value and the current limit value;

基于所述余量通过限幅器进行限幅处理；performing clipping processing by a clipper based on the margin;

基于处理后的补偿余量、无功电流三相电流峰值的最大值和谐波电流的三相电流计算最终补偿电流。The final compensation current is calculated based on the processed compensation margin, the maximum value of the three-phase current peak value of the reactive current and the three-phase current of the harmonic current.

显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

以上仅为本发明的实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均包含在申请待批的本发明的权利要求范围之内。The above are only embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the pending application of the present invention. within the scope of the claims.

Claims (7)

1. A reactive and harmonic compensation method, the method comprising:
when the capacity of the compensation device is smaller than the capacity of the system required compensation:
determining the prior compensation current as the reactive current or the harmonic current based on the compensation current demand of the reactive current and the harmonic current;
when the priority compensation current is reactive current, executing a reactive current priority compensation strategy; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device;
the reactive current priority compensation strategy comprises the following steps:
obtaining reactive current, harmonic current, pure reactive current and appointed harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limiting value, the total compensation current is the final compensation current;
otherwise, generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and comparing the reactive and specified harmonic currents with the compensation current limiting value to determine final compensation current;
the generating of reactive and designated harmonic currents based on the pure reactive current and designated harmonic currents, determining a final compensation current by comparing with the compensation current limiting value, comprising:
sequencing all the appointed harmonic currents in sequence based on the importance degree of the appointed harmonic currents;
sequentially generating corresponding reactive power and designated harmonic current based on the sequenced designated harmonic current;
comparing the three-phase current peak value of the first reactive and specified harmonic current with the current limiting value;
until one phase of three-phase current peak values of the reactive and designated harmonic currents is larger than the current limiting value, or the current reaches the last phase of the designated harmonic currents, and the previous reactive and designated harmonic currents are used as final compensation currents;
and sequentially generating corresponding reactive and designated harmonic currents based on the sequenced designated harmonic currents, wherein the calculation formula is as follows:
Figure FDA0003768999530000021
in the formula i x1 、i x2 、…，i xn Assigning a harmonic current command for idle and designated; i all right angle x0 The command is a pure reactive current command; i.e. i xh1 、i xh2 …i xhn To specify the harmonic current, where n is the number of specified harmonic currents.
2. The reactive and harmonic compensation method of claim 1 wherein the harmonic current-first compensation strategy comprises:
calculating compensation allowance based on the maximum value of the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing by an amplitude limiter based on the allowance;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
3. The reactive and harmonic compensation method according to claim 2, wherein the compensation margin is calculated based on the maximum value of the reactive current and harmonic current three-phase current peak values and the current limit value, and the calculation formula is as follows:
I q0 ＝I lim -I hmax
in the formula I q0 To compensate for the margin; i is lim Is a current limiting value; i is hmax The maximum value of the harmonic current peak.
4. A reactive and harmonic compensation method according to claim 3 wherein the calculating of the final compensation current based on the processed compensation headroom, the maximum of the reactive current three-phase current peaks and the three-phase currents of the harmonic currents comprises:
Figure FDA0003768999530000022
in the formula i x * To the final compensation current; i is q The compensation allowance after the treatment is obtained; I.C. A qmax The maximum value of the reactive current three-phase current peak value; i.e. i xh Three-phase electricity as harmonic currentA stream; i.e. i x0 Is a three-phase current of reactive current.
5. A reactive and harmonic compensation system using the reactive and harmonic compensation method according to any one of claims 1 to 4, wherein the system comprises:
a determination module: when the capacity of the compensation device is smaller than the capacity required by the system to compensate:
determining that the prior compensation current is reactive current or harmonic current based on the compensation current demand of the reactive current and the harmonic current;
an execution module: the reactive current priority compensation strategy is executed when the priority compensation current is reactive current; when the priority compensation current is the harmonic current, executing a harmonic current priority compensation strategy;
wherein, the reactive current priority compensation strategy and the harmonic current priority compensation strategy comprise: and determining final compensation current based on the three-phase current peak values of the reactive current and the harmonic current and the current amplitude limiting value of the compensation device.
6. The reactive and harmonic compensation system of claim 5 wherein the execution module comprises: a reactive current priority compensation submodule;
the reactive current priority compensation submodule is used for acquiring reactive current, harmonic current, pure reactive current and specified harmonic current;
judging the three-phase current peak value of the reactive current and the total harmonic current compensation current;
if the three-phase current peak values do not exceed the compensation current limiting value, the total compensation current is the final compensation current;
otherwise, generating reactive and specified harmonic currents based on the pure reactive current and the specified harmonic current, and comparing the reactive and specified harmonic currents with the compensation current limiting value to determine the final compensation current.
7. The reactive and harmonic compensation system of claim 6 wherein the execution module further comprises: a harmonic current priority compensation submodule;
the harmonic current priority compensation submodule is used for acquiring the maximum values of three-phase current peak values of reactive current and harmonic current based on the reactive current and the harmonic current;
calculating compensation allowance based on the maximum value of the three-phase current peak value of the harmonic current and the current amplitude limiting value;
performing amplitude limiting processing by an amplitude limiter based on the allowance;
and calculating final compensation current based on the processed compensation allowance, the maximum value of the reactive current three-phase current peak value and the three-phase current of the harmonic current.
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